Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a172ce37c1cfe51…

MALICIOUS

PDF

73.8 KB Created: 2021-01-15 00:51:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 900cdc122eb9c49b3e25d7ad6ae78502 SHA-1: b98727f7ed8f8f22ac87de346c44373b4e5f7bd9 SHA-256: 9a172ce37c1cfe51ff5b3e3d4b754cb783143ab572d4ccf29b96db3298c7059d
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm or distribution mechanism. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the embedded URLs and the PDF structure indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/aws?utm_term=hrcp+report+2019 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381347/normal_5fa07e792daf6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366340/normal_5fc6954ad13ea.pdfIn PDF document text
    • https://site-1175983.mozfiles.com/files/1175983/empire_property_builders.pdfIn PDF document text
    • https://fomunova.weebly.com/uploads/1/3/4/6/134684458/tezarap.pdfIn PDF document text
    • https://site-1172684.mozfiles.com/files/1172684/favubedumudumelizagibip.pdfIn PDF document text
    • https://site-1191564.mozfiles.com/files/1191564/31723561528.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pujirageg/vascular_malformation_and_haemangioma.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/nurafowom.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/mapajoxasesapubexuvo.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/terokapiwudud.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/bipikalotenumokura.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/27356925490.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A8 4948 bytes
SHA-256: 3bd0820269d88cd446e67c9c1403e1717e15b1c1d330c70b4a00d941f9ccfeca
font_01_sfnt_off0000f797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF797 10336 bytes
SHA-256: 72b057654256fbf83af9a3cec7f2a9eafb508f021ecef24b4cb1ffed473da648

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